Transfer cylinder for offset printing



May 22, 1928.

INVENTOR 2 Sheets-Sheet l cs A. MAYER TRANSFER CYLINDER FOR OFFSET PRINTING Filed July 12, 1926 M L N .IF

May 22, 1928. 1,670,418

G. A. MAYER TRANSFER CYLINDER FOR OFFSET PRINTING Filed July 12, 1926 2 Sheets-Sheet 2 MEG/mug. I

INVENTOR 1 BMW, M MM.

Patented May i 22, 1928.

UNITED STATES PATENT *o GE ORG E A. MAYER, 01! LAKEWOOD, OHIO, ASSIGNOR TO UNITED AUTOGRAPHIC REG- FFICE.

ISTER COMPANY, or, CHICAGO, ILLINOIS, A CORPORATION OF ILLIN TRANSFER CYLINDER FOR.OFFSET PRINTING.

I Application filed July 12,

This invention relates to improvements in printing apparatus, and more particularly to an improved blanket or transfer cyllnder for use in offset printing processes.

There are different classes of offset processes, notably the so-called wet and dry methodsw In such processes the ink is transferred, from asurface bearing the subject matter or design that is to be printed,

through one or more blanket rolls or cylinders to the paper or other-receiving material.

It is highly essential that the surface of the blanket or transfer cylinder be Very smooth, absolutely true and concentric with respect to the axis of the cylinder, and that the ink carrying surface of the cylinder be as nearly coextensive with the circumference of the cylinder as possible.

The primary purpose of my invention is the production of a transfer cylinder aflording thesedesiderata, while other andmore specific objects are to provide a. device of this character that is verysubstantial and rigid and is so constructed as to facilitate the application and adjustment of the-blanket of rubber or like material commonly used on cylinders. of this class.

In the accompanying drawing, Fig. 1 is an elevation-a1 view of my improved transfer cylinder; Fig. 2 is a partial longitudinal section through the same on a :scale considerably enlarged over that of 'Fig l; Fig. 55 showsone ofthe winding shafts or wind- .lassesiin elevation; Fig. 4 is an end View of the cylinder; Fig. 5 is a similar view of the body of the cylinder with the head removed; Figs. 6 and 7 are sections on the respective lines 6-6 and 7-7 of Fig. 2; and Fig. 8 is a detail in perspective of one end of the blanket.

The-body of the cylinder is designated generally by the reference numeral 1 and is comprised of a'cylindrical wall 2 and relatively heavy end walls 3 which have openings that receive tenons 4 of heads 5 which are secured to the body byycap screws 6. The heads 5 have trunnions 7 that are adapted to be journaled in suitable -be ar- 50 ings in the opposedv housings of a printing press. Strength and rigidity is imparted to the body 1 by radially disposed internal ribs 10' that extend the length of the cylin- 1926. Serial Nb. 121,756.

drical wall 2 and converge toward the longitudinal center of the body where they merge in a nave 11. v I

Arranged transversely of thespace between adjacent ribs, midway between the ends ofthe cylinder, is a substantial web 12 having openings that are preferably lined with suitable bushings 13 to provide bearings for the middle portions of two winding shafts or windlasses 15. .The end portions of the windlasses are reduced in diameter and journaled in suitable bushed openings in the opposed heads 5, said reduced portions extending beyond said heads where they have keyed or otherwise secured to them ratchet wheels 17. The extren'iities of the windlasses are made hexagonal or of other suitable shape to provide portions 18 for the application of wrenches or other turning means. Slots 20 extend entirely through the windlasses between; their reduced ends and their middle bearing portions.

A longitudinal slot 21 is formed in the cylindrical wall 2 midway between the planes'of and parallel with the axes of the windlasses 15. j i I A blanket 23 of rubber. or like material is adapted to be wrapped about the cylinder and to have its ends projected through the slot 21andengaged within the slots 20 of the windlasses 15. The ends of the blanket are notched at their transverse centers. as indicated at 24. to avoid interference with the web 12. After the ends of the blanket are properly inserted through the slots 20 of the windlasses, the windlasses are rotated in opposite directions, as by the application of wrenches or cranks to their extremities 18, so as to draw the blanket tightly about the cylinder; and to insure against the ends of the blanket withdrawing from the slots 20, strips 25 of'suita'ble friction or abrasive material, such as emery cloth, are applied to the blanket. Adjacent the notches 12strips 26 of like material are arranged diagonally of the blanket and these strips tendto PIGL vent wrinkling of theblanket as it is wound about the windlasses. One edge of each of the slots 20 is chamfered, as indicated at 27,

to facilitate the entrance of the blanket,

Pawls 30 are pivoted at 31 to the heads 5 in a position to cooperate with the ratchet wheels 17 and hold the windlasses against retraction and the blanket taut. Springs 32 urge saidrpa' vls into engagement with-the ratchet wheels. y c

Having thus described my invention, what I c laiin i A l 1. it transiei winner eoiiipi isiiigi in' coinbinatioii, a' eylindribal body having an' internal cavity extending substantially throughout the length of the body and a relatively narrow slot opening into the cavityand substantially co-extcnsive in length therewith, windlasses' in the" cavit arranged in substantially parallel relation to each' other and to the slot, the ends of said windlasses being journalet'l in the ends oi the eylinder,'a supp'oi t within the cavity wherein"portions oi the windlassew intermediate their ends are joarnaled, a blanket wrapped about the cylinder and having;- its ends projecting through the slot and fastened to the windlassesrthe ends of the blanltetsbeing notched to aeconnnodate the aforesaid support, and ineajs toil turning the windlasses and for holdingthrin against retraction.

A transfer cylinder coinprisii'in'. incombination; a cylindrical body having an internal ca'vity extending substantially throughout the lengtho'f the cylinder and a slot opening into the cavity and substantially coextensive in length therewith, windlasses inrhe cavity arranged in substantially parallel relation to each other and to the slot, said windlasses'having longitudinal slots extending siibstant-ially diametrically through them, a blanket wrapped about" the cylinder and having its ends proj'e'ct ed through the slot of the cylinder and engaged within the slots oft-he windlasses; the blanket: passing at least once abouteach' Windlass so as to bind the end of the blanket in the slot of the Windlass, and means i'o'r turningthe windlasses and for holding them against retraction.

3. A transfer-cylinder comprising in combination. a cylindrical body'ha'vint; an internal cavity extending: substantially throughout the length of the cylinder and a slot opening into the cavity and substantially coextensive in length therewith, Windlasses in the cavity arranged in substantially parallel relation to each other and to the slot, said udiullatses having longitudinal slots'extendr ing substantially diametrically through them. a blanket wrapped about the cylinder and having its ends projected through the slot oi the cylinder and engaged within the slots of the windlasses;the-edg cs of the entrance sides of thela'tter slots being chaini'ered, the blanket passing'lat least once about each windla ss so as to bind the endo't the blanket inthe slot-of the .windlass, and means for turning the \vindla'sses and for ht'i'ldin'g them against retrartion.

l"! A'transfer cylinder coinnrising, in'conrbination, a cylindrical body having an internal cavity extending substantially throu hout the length of the cylinder and a sot opening into the cavity a'nd s'ubs'tiintially co-extcnsive in length therewith, \vindlasses in the cavity arranged in substantially paralle'l relation tfo'ga'cii otlie'i harm the sldt", said windlii'sises wiring loiiifit iidiiliil"silots, a blanket wrapped about the cylinder and having its ends projected through the slot of the cylinder andengaged within the slots of the windlasses, friction material applied to the ends otthe' blanket for (Bo-action iwitliflic parts of the wincllasses wi'icrewith it:.coirtarts, and means ioitnrniniz the windlasses and for holding them against retract i'on.

A transfercylinder compiisfin min coin liination'. a cylindrical body haa'i' igwm internal cavityextendingsubstantial-1y through outthe length of the cylinder and a'slot" opening into the cavity and? substantially coextensive in'lengththerewith, windla'sses in the cavity ar 'angedin substantially paraliel, relation to each other and to the slot, said windla'sses having longitudinal slbts; a blahket wrapped about the: cylindei and-having itscndsprojected through thmslotof theccyli'nderand engaged within the slots oi the windlhsscs, strips of friction material al plied' to the ends of the blanket for-holding engagement withthe windlasses;certain: of said strips extending diagonallyof thebhinket, and means for turiiing the? windlasse's and for holding them againstretraction.

6. A transfer cylinder eomprisingfincon binatio'n; a hollow cylinder having: strength? ening ribs extending from end-to end of its interior, a relatively narrow longitudinal slot in the wall of the'cylinderibetwmzitljaeent ribs, a support ektei'idingw between said adjacent ribs transversely of: the'cylinder and intermediate the ends thereof, windlasses iirthe space between said adjacent ribs and arranged in substantially phtralll relation to each" other land' to the siot; the ends ofthe windl'asss being journaled with in the ends of the cylinder While, intermediate portions thereof are journal'cd within said support, a blanket wrapped about; the cylinder antl having. its cnds' projected through the slot and fastened to thewind la'sse's; said ends being notched .to accommodate the support, and means for turning! the windlasses and for holding them against IBfl'tlClliOIlL a l r i 7. A transfer cylinder comprisingyin-com binatioin: a' hollow cylindrical bod having ribs on its interior which extend ron'r end to end'of said body adjacent its cylindrical wall and converging to about the middle of the body where; said ribs merge; to forrn' a nave, a slot extending throughoutthe length of the cylindrical wall of the body'between adjacent onesof said ribs," a su'pp'ort disposed transverselyaofi the-body between said adjacent ribs at about the longitudinal cen- Ill) tened to the windlasses, said ends being notched for the accommodation of the aforesaid support, and means disposed beyond the heads for turning the windlasses and for holding them against retraction.

8. A transfer cylinder comprising, in combination, a hollow cylindrical bodyhaving opposed end walls and provided with ribs on its interior which extend from one to the other of said end walls, the end walls having openings, a slot extending throughout the length of the cylindrical wall of the body between adjacent ones. of said ribs, 8. support disposed transversely of the body between said adjacent ribs at about the longitudinal center of the body, windlasses occupying the space between saidadjacent ribs and having their middle portions'journaled within said support, heads applied to the opposite ends of the body and wherein the ends of the windlasses are journaled, the heads having tenons fitting within the openings of the. end Walls, a blanket wrapped about the cylinder and having its ends projected through said slot and fastened to the windlasses, said ends being notched for the accon'nnodation of the aforesaid support, and means disposed beyondthe heads for turning the windlasses and forholding them against retraction.

In testimony whereof, I hereunto afiix my signature. e

GEORGE A. MAYER. 

